S-91772A265 2-56 x 9/16" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments and outdoor applications.
• High tensile strength of 70,000 psi ensures reliable, long-lasting fastening under significant mechanical stress and vibration.
• Excellent thread engagement with Class 2A fit and coarse UNC threading for quick, secure installation and reduced cross-threading risks.
• Optimized drive performance featuring a No. 1 Phillips drive and rounded pan head for efficient torque application and a low-profile finish.
• Full threading along the 9/16" length provides maximum grip and uniform clamping force across the entire fastened joint.
• Consistent hardness (Rockwell B70) maintains structural integrity and resists wear, deformation, and stripping during repeated use.
• Compliance with major industry standards including ASME B18.6.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

This 2-56 UNC pan head machine screw is engineered to address critical challenges in precision assembly and industrial maintenance. The passivated 18-8 stainless steel offers exceptional resistance to oxidation and chemical exposure, making it suitable for electronics, automotive components, and marine equipment where moisture and corrosive agents are prevalent. The coarse thread spacing and Class 2A thread fit facilitate rapid installation while minimizing the risk of thread damage, enhancing productivity on high-volume production lines. With a rounded pan head and Phillips drive, it ensures a flush mount and reliable torque transfer, reducing operator fatigue and improving joint consistency. These features collectively deliver a durable, compliant fastener that extends service life and reduces maintenance costs in demanding applications.

Specification Summary & Compliance

This screw adheres to precise dimensional standards with a Class 2A thread fit and UNC coarse thread spacing, manufactured in compliance with ASME B18.6.3 specifications. It is fully certified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for hazardous substance restrictions.